All these rocks aforementioned are mainly parametamorphic rocks . milan, kaqiang and alamasi group underwent high-grade metamorphism of amphibolite facies, together with weak migmatism . they share the same geochemistry and total ree and many other chracters 二者主要为副变质岩石,米兰岩群和卡羌岩群、阿拉玛斯岩群变质较深为角闪岩相,普遍弱混合岩化,它们具有非常相似的地球化学特征,稀土元素总量及其它特点一致或相近。